﻿<div id="scrollview-demo">
    @(Html.DevExtreme().ScrollView()
        .ID("scrollview")
        .ScrollByContent(true)
        .ScrollByThumb(true)
        .OnReachBottom("scrollView_reachBottom")
        .ReachBottomText("Updating...")
        .ShowScrollbar(ShowScrollbarMode.OnScroll)
        .Content(@<text>
            <div id="scrollview-content">
                @for(var i = 0; i < 10; i++) {
                    <span>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                    sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
                    Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
                    aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit
                    in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
                    Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
                    officia deserunt mollit anim id est laborum.</span><br/><br/>
                }
            </div>
        </text>)
    )

    <div class="options">
        <div class="caption">Options</div>
        <div class="option">
            <span>Show scrollbar:</span>
            @(Html.DevExtreme().SelectBox()
                .ID("show-scrollbar-mode")
                .Items(items => {
                    items.Add().Text("On Scroll").Option("value", "onScroll");
                    items.Add().Text("On Hover").Option("value", "onHover");
                    items.Add().Text("Always").Option("value", "always");
                    items.Add().Text("Never").Option("value", "never");
                })
                .Value("onScroll")
                .ValueExpr("value")
                .DisplayExpr("text")
                .OnValueChanged("selectBox_valueChanged")
            )
        </div>
        <div class="option">
            @(Html.DevExtreme().CheckBox()
                .Value(true)
                .Text("Update content on the ReachBottom event")
                .OnValueChanged("reachBottom_checkBox_valueChanged")
            )
        </div>
        <div class="option">
            @(Html.DevExtreme().CheckBox()
                .Value(false)
                .Text("Update content on the PullDown event")
                .OnValueChanged("pullDownBottom_checkBox_valueChanged")
            )
        </div>
        <div class="option">
            @(Html.DevExtreme().CheckBox()
                .Value(true)
                .Text("Scroll by content")
                .OnValueChanged("scrollByContent_checkBox_valueChanged")
            )
        </div>
        <div class="option">
            @(Html.DevExtreme().CheckBox()
                .Value(true)
                .Text("Scroll by thumb")
                .OnValueChanged("scrollByThumb_checkBox_valueChanged")
            )
        </div>
    </div>
</div>

<script>
    var updateContentTimer;

    function getScrollViewInstance() {
        return $("#scrollview").dxScrollView("instance");
    }

    function updateScrollViewContent(eventName, insertBefore) {
        if(updateContentTimer) {
            clearTimeout(updateContentTimer);
        }
        updateContentTimer = setTimeout(function() {
            $("#scrollview-content")[insertBefore ? "prepend" : "append"](
                "<br /><div>Content has been updated on the " + eventName + " event.</div><br />"
            );
            getScrollViewInstance().release();
        }, 500);
    }

    function scrollView_reachBottom(args) {
        updateScrollViewContent("ReachBottom", false);
    }

    function selectBox_valueChanged(data) {
        getScrollViewInstance().option("showScrollbar", data.value);
    }

    function reachBottom_checkBox_valueChanged(data) {
        getScrollViewInstance().option("onReachBottom", data.value ? updateScrollViewContent.bind(null, "ReachBottom", false) : null);
    }

    function pullDownBottom_checkBox_valueChanged(data) {
        getScrollViewInstance().option({
            onPullDown: data.value ? updateScrollViewContent.bind(null, "PullDown", true) : null,
            bounceEnabled: data.value
        });
    }

    function scrollByContent_checkBox_valueChanged(data) {
        getScrollViewInstance().option("scrollByContent", data.value);
    }

    function scrollByThumb_checkBox_valueChanged(data) {
        getScrollViewInstance().option("scrollByThumb", data.value);
    }

</script>
